Idaho Code § 72-443

No claim for disability or death from silicosis shall be maintained or prosecuted unless during the ten (10) years immediately preceding the date of disablement the employee has been exposed to the inhalation of silica dust over a period of not less than five (5) years, the last two (2) of which shall have been in this state, under a contract of employment existing in this state, provided, that if the employee shall have been employed by the same employer during the whole of such five (5) year period his right to compensation against such employer shall not be affected by the fact that he had been employed during any part of such period outside of this state.